Combined type-writing and computing machine.



w. L. GUMPHECHT. COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED OCT. 12 I912.

Patented Aug. 21, 1917.

2 SHEETS SHEEI' I.

W. L. GUMPRECHT.

CONiBlNED TYPE WRlTING AND COMPUTING MACHINE.

APPLICATION HLED OCT. 12, 1912.

Patented Afig. 21, 1917.

2 SHEETSSHEET 2.

l i dlr/, J is pfiwavkra Q azmww will'be done.

- UNITED STATES PATENT OFFICE.

wmnuu L. eumrnncn'r, or nnooKLYN, NEW YORK, ASSIGNOR, isY MEsnE ASSIGIL' HENTS, 'I'O UNDEBWOOD COMPUTING MACHINE COMPANY, OF NEW YORK, n. Y., a

.COBPOBATION OF NEW YORK.

COMBINED TYRE-WRITING AND COMPUTING MACHINE.

To all whom z'tmay concern:

Be it known that I, WILLIAM L. GUM- PRECHT, a citizen of the United States, residing in Brooklyn, in the county of Kings and 5 State of New York, have invented certain new and useful Improvements in Combined Type-Writing and Computing Machines, of which the following is a specification.

This invention relates to combined typewriting and computing machines and most of its features are especially adapted to be used in machines of the class in which numeral keys on the typewriter are caused to set certain members or pins in the computing mechanism which members are subsequently employed for determining the rotation of the computing wheels.

These pins are usually placed upon bars, one bar for each denomination; and the bars are displaced one after another as the typewriter carriage makes its letter-feeding movements; a dog being connected to the typewriter carriage, and a set of jacks being operated 'sem'atim by said dog, the jacks being connected to the corresponding computation pin bars to displace or set the same. When the carriage stands at any point, the

computation pin bar of corresponding dc nomination is displaced .or set, and when a numeral key of the typewriter is depressed to print a figure at that point, the corresponding pin is set upon the displaced computation bar. After the pins have been set on all the bars in this manner, a general operator is employed for turning all the dial wheels by means of the set pins.

' In certain forms of said combined typewritingand computing machines, the computing mechanism may be silenced by eflecting a'separation between the dog on the carriage and the set of jacks. This has been done by swinging saiddog out of thepath of said jacks. This silencing .has been arranged to be automatically brought about whenever the case-shifting mechanism of the typewriter is usedyso that when upper-casecharacters are being written no computation for causing the tabulator keys and the back- 1ngmechanism.

According to the present invention, the numeral keys are locked whenever said com- I putingmechanism is silenced by the opera- Provision has also been madev spacingdog to likewise silence said comp ut Specification of Letters Patent. Patented Aug. 21,1917.

Application filed October '12, 1912. Serial No. 725,384.

tion of the tabulator key or the back-spacin key and during the movement of the shi t key to and from its uppercase position.-

numeral keys according to the present invention may be locked by swinging a member in between said dogs whenever the connection between the numeral keys and the computing mechanism is, silenced. Said member 'will then look all the numeral keys against operation in the same manner as any key will look all the others against operation.

The present invention may likewise include means for silencing the connection between the numeral keys and the computing mechanism whenever the general, operator is in any but its normal idle position.

I Other features and advantages'will hereinafter appear.

In the accompanying drawings,

Figure 1 is a sectional, central, longitudinal view taken from front to rear of an Underwood-Hanson combined tyxpewriting and computing machine, embodying the present improvements in one form.

Fig. 2 is a rear elevation, showing a plurality of selecting dogs on the carriage, one dog being shown in effective position, while another is dropped.

Fig. 3 is a detail, showing the mechanism after looking the numeral keys.

Fig. 4 is a perspective rear view, showing key-locking mechanism.

a,... Fig. 6 is a side view of a detaiL shoWing how the key-locking means is controlled by the mechanism in Fig. 5.

The typewriter comprises numeral keys 1 and alphabet keys 2, which depress lovers 3 to vibrate bell cranks 4; the latter engaging type bars 5 to swing them up to strike against a platen 6 mounted on a carriage 7. The carriage is driven by a spring barrel 8, and its letter-feeding movements are controlled by a rack 9, which meshes with a pinion 10 connected to an escapement wheel 11, whose movements are controlled by dogs 12; said dogs operated by a universal bar 1133 which is actuated by heels 14 on the typears.

The numeral keys have stems 15 to engage and depress arms 16 on rock-shafts 17, forming parts of linkages 17 to depress or set computation pins 18 on bars 19, which extend forwardly and rearwardly and have at their forward ends racks 20 to mesh with pinions 21 on computation wheels 22.

The typewriter carriage 7 is connected with means to raise the computation racks or bars 19 seriatim, so that when said carriage is in position for writing at any point in a column, the computation bar of the corresponding denomination will be raised; and hence when a, numeral key is depressed, to write at said point in the column, the linkage 17 connected to said key will depress that particular pin 18 on the lifted Ear 19 which corresponds to such depressed The pins when depressed are utilized for turning the computation wheels 22; the racks 19 being for this purpose driven by a general operator, which may comprise a handle 23 connected to a shaft 24, on whose ends are fixed segments 25, meshing with idle pinions 26, the latter meshing with racks 27 guided in the opposite sides of the machine. Each rack has an offset arm 28,- and these arms are rigidly connected by rear and forward cross-bars 29, 30, disposed just beneath the computation bars 19, so that when any pins 18 are de ressed, the rear cross-bar 29 may, when riven forwardly by handle 23, engage the depressed pins 18 and drive their bars 19 forwardly. The racks 20 when thus driven forwardly turn the wheels 22, each to an extent dependent upon the pin depressed. Upon the return of the handle 27 of the general operator, the forward cross-bar 30 engages shoulders 31 upon said computation bars, to return them rearwardly to normal positions.

The lifting of the bars 19 to bring their pins within range of the key-operated linkages 17 is effected by the letter-feeding carriage 7 of the typewriter. Upon the rear of the carriage is mounted a dog or tappet 32, to engage jacks 33, pivoted at 34 upon a bracket and at their rear ends adapted to depress links 35, whose lower ends are pivoted at 36 to levers 37 These levers are adapted to operate linkages 38 to lift the rear portions of the computation bars 19;

these linkages forming a denominationtransposing device as usual in said Underwood-Hanson machine.

Each of the dogs 32 (of WhlCll several may be employed) is pivoted at 39 upon a block or carrier 40, which is swiveled upon, and adjustable along a rod 41 fixed upon the carriage, and has a tooth 42 to look into any of a series of notches 43 formed at letter-space intervals in a rod 44, also fixed upon the carriage. By swinging the carrier 40 up free of the rod or rack 44, the block 40 may be adjusted along said rod and then reengaged with the notches therein.

'7 The platen 6 is usually mounted upon a frame 45, which can shift up and down for writing upper-case and lower-case characters. Normally the lower-case types 46 strike the platen, but when the latter is shifted up, the upper-case characters '47 make the lmpressions. The figure types are included in the lower-case set 46; but when the capital shift key 48 is depressed, it is not desired to have any of the computing mechanism operate, as figures are not provided in the upper-case set of types 47. The following mechanism is connected to the platen-shifting devices for silencin the selecting dog 32 at this time.- The p ateh frame 45 is usually mounted on a pair of arms 49 hinged upon the carriage frame 7, and a rail 50 is employed for lifting the platen frame, the latter having a roll 51 to run upon said rail. Rail 50 is mounted upon a frame 52, which is operated by a key lever 53, said lever bearing the key 48; and this frame also usually comprises a rock shaft 54 connecting its ends. Extending rearwardly from this rock shaft is an arm 55, having on its rear end a roll 56 to enga e a cam arm 57 which depends from a roc shaft 58. Supporting arms 59 extend up from said rock-shaft 58, and carry attheir top a roll 60 which roll supports the dog carrier, and so forms a removable sup ort for a roll 61 on said dog-carrier 40. he normal position of the parts will be seen at Fig. 1, in which the dog 32 and its carrier 40 are held in effective elevated positions by the roll 60.

When the platen 6 is shifted up, the arms 59 are brought back, and permit the carrier 40 to drop, together with the dog 32, so that the latter drops below the jacks 33 and cannot operate the latter. A spring 61 holds the rock-shaft 58 in its normal position to support the dog 32 in its elevated position. The dog-releasing or silencing roll 60 should be of a length equal to or greater than the width of the set of jacks 33 (see Fig. 2), so as to hold the dog in elevated effective position during the time that the dog 32 is traversing the set of jacks. At each end the releaser-roll 60 is provided with a cam,

which may be in the form of a coned end 62 formed upon the roll. This cone serves to memes camthe carrier upwardl to effective osition durin the run of t e carriage, i the releaser-ro l 60 is in normal Fig. 1 position. The dog-roll 61 is preferably pointed or coned, as' shown to facilitate operation thereon of the releaser-roll 60. It will be .understood that the releaser-roll does not need to rotate in all cases, nor is it always necessary to make an anti-friction roll on the dog-carrier 40. By reason of the cam connection at.56, 57 it will be seen that it is possible to effect the releasin operation of the rock-shaft 58 without isturbing the arm 55, or the case-shifting. mechanism to which it is connected.

Said Underwood typewriting machine usually is provided with a tabulating mechanism includin a set of tabulating keys 63 and levers 64, lcrumed at 65 and at their rear ends connected to raise decimal stops 66, which cooperate with column stops 67 on the carriage. Upon each of the decimal stops isfor med a shoulder 68. These shoulders move the releaser roll to ineffective position when elevated, and for this purpose engage a universal bar 69 fixed upon a rockshaft 70, from which extends an arm 71, having a pin 72 extending within a slot 73 in a link 74:, whose upper end is pivoted at 75 to an arm 76, extending rearwardly from said rock-shaft 58, so that Whenever any decimal. stop is lifted by its key 63, the releaser-roll or member 60 will be rocked backwardly to permit the dog-carrier to drop, thus preventing the rapid movement of the carriage from effecting injury to the dog 32 or the jacks.

From the rock-shaft 7 0 extends the usual carriage releasing arm 70 which is con nected by an upstanding link 77 to a lever 78, which carries at its opposite end a roll 79 to take under the carriage-feedingrack' 9, and release the same from the control of r the letter-feeding dogs, and permit it to run rapidly under the influence of its spring 8.

The carrier 40 is adjusted to a position to correspond with the position of the column stop 67 on the paper carriage 7, and not withstandin the fact that the tabulator key 63 silences 0g 32, still it is true that upon the release of the tabulating key and the camming up of the carrier 40 hymember 60, said dog 32 will engage and raise the overlying jack 33, so that the rele "se of said tabulator key occasions the raising of one of the computation-pin bars 19 to effective position for the'settingof a pin thereon by a numeral key. The slot 73 in the link 74 permitsthe rock shaft 58 to be operated independently of "the tabulator mechanism.

There is usually provided upon said Underwood typewriter, back-spacing mechanism, portiomo' whiclris seen at Fig. 4, said portion coy key 80 and a of a lens: 81, k v ch said key is mounted. From the stem of said key projects a pin 82, which overlies the forwardlyextending portion 83 of lever 53, so that whenever the back-spacing key is operated, the shift-key is also depressed, and hence the mechanism is set in motion which swings the releaser-roll 60 back, to permit the dog 32 to drop. At this operation the case-shift mechanism shifts idly; but the carriag is set back a single letter-space, and upon the release of the back-spacing key 80, the dog 32 will lift the corresponding jack 3s.

The pivoting of the dog at 39 permits the latter to slip idly past the jacks during the return of the carriage. Owing to the pivoting of the dog at 39, there occurs consider able of the return motion of thecarriage be fore said dog slips past the first jack at the right, Fig. 2. The back-spacing key does not step the carriage back so far, but the provision of the pin 82 on the back-spacing key permits the dog to drop out of effective position and so maintain its upright position as seen in dotted lines at Fig. 2, while traversing the set of jacks and upon release ofsaid key 80, said dog will lift the overlying jack, and hence this advantage in prior apparatus, arising from pivoting the dog at 39., is overcome.

The Underwood-Hanson machine usually comprises means for reventing the simultaneous depression of more than one numeral key, and said mechanism comprises a series of pivoted dogs 85, as seen in Figs. 3 and 4, between which dogs the pendents 86 on the numeral keys 1 are arranged to pass as eachqnuneral key is depressed. Said dogs, as shown in Fig. 3, are spaced slightly apart, and the throw of said dogs is limited by abutments in the form of screws 87, there being one abutment at each end of the series of dogs. Said dogs by being spaced a little way apart are allowed a little throw, and said throw of all the dogs 85 is sufficient ,to let one of the pendents 86 pass between two dogs, but in so doing it closes the space between all the other dogs, so that no other pendents can then pass between any two other dogs. In this way it becomes impossible to depress any other numeral key.

All the numeral keys are arranged to be locked by the dogs every time the releaserroll 60 moves through a certain part of its angular travel, to swing the dog 32 to ineffective position. For this purpose said releaser-roll is arranged, when swung outwardly a certain distance, to strike with its reduced end 62, the raised portion 115' of a cam surface 89 on a lever 88, so that when said releaser-roll is swung outwardly to the proper extent, said lever 88 will be swung downwardly, and in so doing, connections presently to be described, will raise a memher 90 between the backs of two of the locking dogs 85. Said member is of the same width as a pendent '86 of a numeral key, and when said member occupies the position seen in Fig. 3, it will prevent the depression of any numeral key. The connections between said lever 88 and member 90 include a rod 91 pivotedat' one end to the lever 88, and at its opposite end at 92 to a bell crank 93 pivoted on the frame of the machine. The other arm of said bell crank 93 is pivoted to a cross-bar 94 on a link 94 extending forwardly to a rock-arm- 95 carrying a pin 96, which rides in a slot 97 in said link, so that when said link 94 is drawn rearward it swings the rock-arm 95 and turns rock-shaft 98 and with it rock arm 99. Thus, aspring 100 on said rock-arm 99 extending to said member 90 draws it upwardly into locking position whenever the releaser-roll 60 is swung toa position over the cam portion 115. The member 90, it will be seen, swings freely on the rock-shaft 98, and is limited in such swing by abutments 101 and 102 vforming the ends of a slot in which said rock-arm 99 passes through the hub of said member 90. It will be seen that if said member 90 is drawn upward to enter between the dogs 85, while a numeral key is depressed, the spring 100 will yield instead of forcing the member between said dogs. This will prevent the catching of a key by jamming between the dogs.

Two of the jacks correspond respectively to I the decimal point between dimes and dollars, and to the comma between hundred thousands and-millions; These are connected to operate the member 90 by bell cranks 93 identical with the bell crank 93 which is operated by link 19, so that the numeral keys are locked thereby when the comma and the period should be written.

A connection is also provided between the general operator and the computing mecha-.

nism, so that unless said general operator is resting in its normal idle position, the connection between the dog 32 and the jacks 33 is silenced. For this purpose there is formed in one of the racks 27 of the general operator, a notch 103, in which normally rests idly an elbow arm 104 pivoted in the frame of the computing mechanism and carrying a bell crank arm 105, which is arranged, through connections to be described later, to swing the releaser-roll 60 to silencing position. The connections between the bell crank arm 105 and said releaser-roll 60 include a bar 106 riding on an idle rock-arm 107 at the forward end of'the machine and carrying a depending arm 108 fast'on it, which is arranged to be struck by said bell crank arm 105 whenever the general operator moves forward in carrying the number recorded in the computation racks 19. into the computing wheels.

When it so moves forward, the elbow am 104 rides out of the notch 103, and causes bell crank arm 105 to strike against the arm 108, and move the bar 106 rearwardly, so that the pivot 109 on its rear end, on bell crank 110 will swing up the other arm 111 of said bell crank, and a roll 112 pivoted thereon will swing an arm 113 fast on the shaft 58 on which the silencing roll 60 is carried by rock-arms 59. The arm 111 of bell crank 110 is normally held downward by means of a spring 114 encircling. the shaft on which it is pivoted.

The cam 89 which controls the numeral key-locks is extended to have a short flat raised portion 115 on which the releaserroll 60 rides when the platen is partly shifted to its upper-case position. When, however, the platen is wholly shifted upward, the releaser-roll 60 reaches a hollow 116 in said cam 89 and thus releases the dogs 85 from the member 90, so that in the uppercase position, the numeral keys are not locked and the platen can receive impressions from them.

In order to cause the connection between the back-spacing key and the platen shift key to lock the numeral keys in the manner described, it is necessary to provide, in the present form of the invention, that the backspace key in shifting the platen shall shift it part way only to the upper-case position, so that the releaser-roll 60 will occupy its intermediate osition over the raised fiat portion 115 of the cam 89. For this purpose, the pin 82, which is arranged to catch the forwardly extendingarm 83 of the shift key is arranged to strike said arm only after said back-space key has been part way depressed. In this way the back-space key only shifts the platen part way to its uppercase position. Said shifting is enough to silence the connection between the dog 32 and the jacks 33, but is not sufiicient to unlock the numeral key dogs 85 after looking them by means of the raised flat part 115 on the cam 89. l

The arm 88 with its cam 89 is held so that releaser-roll 60 will strike it, by a spring 117 which swings rock-shaft 98 by an arm 118 fast thereon; said spring being anchored in a lug 119 projecting from the frame 120 carrying the linkages 17 Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I

claim:

1. The combination of a system of computation devices, a carriage, a dog on said car'- riage, a set of denomination-selectin for said computation devices'moun on the machine frame and operable. in :succession by said dog during the travel ofi the car-r jacks riage, keys, including numeral keys, for efamass footing the travel of said carriage, means for automatically efi'ecting separation between the dog and the jacks to prevent operation of the jacks by the dog, and a device con-- nected to be operated by said automatic separating means for locking said numeral keys against operation.

2. In a combined typewriting and computing machine,.the combination with computing devices and actuating means therefor, of a traveling carriage including both numeral and other keys for controlling the movements of the carriage, said numeral keys also controlling computation, and said other keys includin tabulating and backspacing keys and said carriage arranged to travel step bystep under the control of the said numeral keys so as to co-act with the successive computmlgl devices in denominatlonal order, norma y mefi'ective means to lock the numeral keys against operation, and

means common to said other keys and brought into actionwhen any of said other keys is acting on said carriage, to silence said computing devices and to render said lockin means effective.

, '3. 'fiie combination of. a system of computation devices, a carnage, a dog on said carriage, a set of denomination-selecting jacks of; the machineframe and operable in succession by said dog, keys, figure types operated by said keys, a releasing bar on the machine frame, a carrier on which said dog is pivoted, a rod upon said carriage along which said carrier. is adjustable and upon which it may be swung by said releaser bar to silence said 0g, and a device for automaticall locking said keys when said releasing ar is swung to silence said dog.

4. The combination of a system of computation devices, a carriage, a dog on said carriage, a set of denominationselecting jacks on the machine frame and operable in succession by said dog, keys, figure types operated by said keys, a releasing bar on the machine frame, a carrier on which said dog is pivoted, a rod upon said carriage along which said carrier is adjustable and upon which it may be swung by said releaser bar to silence said dog, means for locking said keys when said releasing bar is swung to silence said dog, and a connection between said locking means and said releasing bar whereby when said releaser bar silences said dog it may be arranged to occupy one position to lock said keys and another position to unlock said keys.

5. In a combined typewriting and COII1 puting machine, the combination with numeral keys and a traveling carriage, of a denomination selector controlled by said carriage, a lock for said numeral keys, and a single means for silencing said denominw tion-selector and locking said numeral keys.

6. In a combined typewriting and computing machine, the combination with a locking mechanism for preventin the operatim. of more than one numera key at a time, of a denominationselector, means for silencing it, and means controlled said denomination-selector silencer for 'l c'kin all said numeral keys by said first-name locking means.

7. In a combined typewriting and computing machine, the combination with numeral keys and computing wheels, of a lock for preventing the operation of one numeral key while another is depressed, a shiftable platen, a key for shifting it, and shift-keyeontrolled means for looking all the numeral keys by said lock.

8. a computing machine, the combinationpwith numeral keys and computation members in which numbers are registered by said keys, of computation wheels into which said numbers are carried, a general operator movable to carry numbers from said members into said wheels, an arm adjacent said operator, and a bar on said operator holding said arm to effect the locking of said keys while said general operator is moved from its normal position.

9. In a combined typewriting and computing machine, the combination with computing devices, of a traveling carriage and numeral keys, said carriage arranged to travel step by step, under the control of said numeral keys during computation, so as to co-act with the successive computing devices in denominational order, means for silencin the selection of denominational orders y said numeral keys, tabulating mechanism comprising keys for positioning said carriage, and means brought into action by any one of said tabulating keys during the tabulating runs of the carriage for lockin said numeral keys against operation, sald locking means acting through the medium of said silencing means.

10. The combination of a series of computation devices, a carriage, a dog on said carriage, denomination-selecting means associated with said computing devices mounted on the machine frame and operable by said dog, keys, figure types operated by said keys, a releasing device mounted on the machine frame and extending in the direction of the run of the carriage, means for operating said releasing device to shift the dog away from said selecting means, a case-shift mechanism, a key-locking mechanism, and means connected to said case-shift mechanism to op crate said releasing device and to operate said key-locking mechanism.

11. In a combined typewriting and com- *puting machine, the combination with numeral keys, of a series of dogs arranged to prevent the depression of one numeral key while another is depressed, a member arranged to enter between said dogs to prevent the depression of any numeral key, a shaft on which said member is mounted, and a spring arranged to yield if said member is unable to enter between said dogs.

l2. In a combined typewriting and computing machine, the combination with numeral keys and computing mechanism controlled thereby, of a denominational selecting device carried by said carriage, said carriage arranged to travel step by step, under the control of the numeral keys, to enable said denominational selector to determine denominational orders in said computing mechanism, a back-space key for returning the carriage letter-space intervals, means for silencing said denominational selector, and means for locking said numeral keys, said back-space key acting through the medium of said silencing means to bring said key lockin means into action. 1

13. Wheels, numeral keys, and computation members in which numbers are registered by said keys; of a device for connecting said. keys and computation members together, so as to enable such registration; a general operator for said computation members, to carry numbers so registered into said wheels; locking means for said numeral keys; and means brought into action automatically by a movement of said general operator out of its normal position for simultaneously disconnecting said device and actuatin said locking means.

14. n a combined typewriting and computing machine, the combination with numeral keys, com utation members and com-' puting wheels, 0 a traveling carriage, means for registering in said computation members numbers written by said keys, a comma key locking jack, a period key locking jack, a

neral operator for carrying numbers registered in said members into said computing wheels, a locking arm 0 erated by said operator, and a single 10c operated by said jacks and arm.

15. The combination of interlocking means, a case shift, a back space, a tabulating, and an operating means, all locking through said interlockinglmeans, and computer-silencing means t rough which all said means operate.

16. In a combined typewriting and computing machine, the combination with a traveling carriage and numeral ,keys, of a denomination selector on said traveling carriage, a silencing roll for moving said selector to inefi'ective position, devices in which the numbers written by said keys are temporarily set up, a general operator for carrymg the numbers so set up into a totalizer, and a single lock for said numeral keys controlled by said silencing roll for locking said keys during the operation of a tabulating he combination, with computingkey, a back-space key, or when the general operator is moved from its normal position.

17. The combination, with a register or totalizer, and actuating means therefor; of numeral keys for controlling the extent of movement of said actuating means; a denomination selector cooperative with said actuating means; a lock for said numeral keys; and means for simultaneously silencing said selector and operating said lock.

18. The combination, with a register or totalizer, and actuating means therefor; of numeral keys for controlling the extent of movement of said actuating means; a denomination selector cooperative with said actuating means; a lock for said numeral keys; means for silencing said selector; and means operated automatically by the silencing of said selector for bringing said look into action.

19. In a combined typewriting and computing machine the combination with numeral keys, of a lock for said numeral keys, a denomination selector, and means for making said lock effective by moving said denomination selector to ineffective position.

20. In a combined typewriting and computing machine, the combination with numeral keys, of a lock for said numeral keys, a denomination selector, means for makin said lock efiective by moving said denomination selector to ineffective position, and means for releasing said look while moving said selector still farther from eflective position.

21. In a combined ty ewriting and computing machine, the combination with a carriage and keys including numeral keys, for controlling the ste by step movement of the carriage of a lock or said numeral keys, preventing operation of one of said numeral keys when another is depressed, case-shift mechanism and means brought into action automatically by the operation of said caseshift mechanism for actuating said lock to prevent computation while said case-shift mechanism is in action.

22. In a combined typewriting and computing machine, the combination with a carriage, of computin mechanism and numeral keys controlling t e same, a lock for preventing operation of any numeral key while another is depressed, a back-space key for shifting said carriage letter-space intervals in a rearward direction, and means for looking all of the numeral keys by said lock, broughtinto action by the operation. of said back-spacing key.

23. A computing typewriter combining a typewriter carriage, step-by-step traversing mechanism therefor, a computer for registering items, numeral keys for printing the items and causing the registration thereof and controlling the traverse of said carriage by said traversing mechanism, a back-spacing key for said carriage, and means controlled by said back spacing key for locking the" numeral. keys against operation and simultaneously silencing the computer.

24. A computing typewriter combining a typewriter carriage, step-by-step traversing mechanism therefor 'acomputer for registertypewriter carriage, 'a computer for registermg items, numeral keys for printing the items and causing the registration thereof and causing a letter-feeding traverse of said carriage, a shift-key for causing the numeral keys to rint characters other than numerals, means or silencing-the computer automati cally by the operation of the shift-key, and shift-key-controlled means for locking the numeral keys against operation during the movement of the shift-key and for releasing the numeral keys when the shift-key is in either of its operating positions.

26. In a combined typewriting and pomputing machine, the combination, with 331881, of computing wheels, and actuating means therefor; of a movable carriage; keys, in cludin both numeral and other keys, for contro ling the various movements of the carriage, said numeral keys also controlling the extent of movement of said actuating means; a denomination selector for connecting the numeral keys with said actuating means; locking means for said numeral keys; and means operable automatically by the actuation of 'one of the other keys for disconnecting said selector and simultaneously bringing said locking means into action.

27. In a combined: typewriting and computing machine, the combination, with a set of computing wheels, and actuating means therefor; of a movable carriage; keys, including both numeral and other keys, for controlling the various movements of the carriage, said numeral keys also controlling the extent of movement of said actuating means; a denomination selector for connecting the numeral keys with said actuating means, comprising" a shiftable member for governing the efiectiveness of said selector; ocking means for said numeral keys; and means operable automatically by the actuation of one of the other keys for shifting said governing member into inefliective posi tion, so as to disconnect the selector, and simultaneously bringing said locking means into action.

28. In a combined typewriting and computing machine, the combination, with a set 01'' computing wheels, and, actuating means therefor; of a movable carriage; keys, including both numeral and other keys, for controlling the various movements of the carriage, said numeral keys also controlling the extent of movement of said actuating means; a denomination selector for connecting the numeral keys with said actuating means, comprising a shiftable member for governing the effectiveness of said selector; locking-means for said numeral keys; means connected to actuate said lockin means; means operable automatically by t e actuation of one of the other keys for shifting said governing member into ineffective position, so as to disconnect the selector; and means operated by said governing member during such movement for bringing the actuating means for the locking means into action.

29. In a combined typewriting and computing machine, the combination, with a set of computing wheels, and actuating means therefor; of a movable carriage; keys, including both numeral and other keys, for controlling the various movements of the carriage, said numeral keys also controlling the extent of movement of said actuating 5 means; a denomination selector for connecting the numeral keys with said actuating means, comprising a shiftable member for governing the effectivenessof said selector; locking means for said numeral keys; and means operable automatically by the actuation of one of the other keys for shifting said governing member into ineflective position, so as to disconnect the selector, said member being arranged to initially actuate andsubsequently release said locking means durin said shifting movement.

30. n a combined typewriting and computing machine, the combination, with a set of computing wheels, and actuating means therefor; of a movable carriage; keys, including both numeral and other keys, for controlling the various movements of the car riage, said numeral keys also controlling the extent of movement of said actuating means; a denomination selector for connecting the numeral keys with said actuating means, comprising a shiftable member for governing the eifectiveness of said selector; locking means for said numeral keys; means operable automatically by the actuation of one of the other keys for shifting said governing member into ineiiective position, so as to disconnect the selector; a lever operated by said governing member during said shifting movement; and connections between said lever and said locking means for actuating the latter when the former is so actuated.

31. In a combinedtypewriting and computing machine, the combination, with a set 18c the extent of movement of said actuating means; a denomination selector for connecting'the numeral keys with said actuating means, comprising a shiftable member for 10 governing the effectiveness of said selector;

lockin means for said numeral keys; means operatic automatically by the actuation of one of'the other keys for shifting said governing member into ineffective position, so

009m of this pctntmy be obtained for ipsvpss as to disconnect the selector; a lever arranged in the path of said govern' member and arranged to be engaged an operated by the same during said shifting movement; and connections between said lever and said locking means for actuating the latter from the former said lever having front and rear cam portions for successively causing the actuation and release of said locking means.

WILLIAM L. GUMPRECHT. Witnesses:

F. E. ALEXANDER, J. A. BROPHY.

five cent: each, by addressing the "commissioner of Patents.

Washington, D. O. 

